Lens Holder for 50mm Diameter Lens or Mirror Item Type_Tongs the smaller-tube counterpart to the

the smaller-tube counterpart to the 300x44mm standard rheostats with the same constantan-winding construction

supplied in a protective case so spare leaves stay flat and undamaged until installation

Long-and-narrow 6 by 1-inch plane glass mirrors arrive as 10-packs at ~2mm thickness

Spark in 20mm

Wood-based hydrostatic balance with two long pans and one short pan adjustable along a central column

Lens Holder for 50mm Diameter Lens or Mirror Item Type_Tongs the smaller-tube counterpart to theVersatile holder accepting either a 50mm diameter lens or mirror, the dual purpose mount giving optics setups one fewer accessory to track across reflection and refraction experiments.